Transmission of Vertical Vibration to the Human Foot and Ankle

The load absorbing capability of the foot and ankle system (FAS) was characterized by measuring the transmissibility and the phase delay at the medial malleolus and the tibial tuberosity. The FAS of twenty subjects were exposed to sinusoidal vertical excitation (10–50 Hz with 5 Hz increments and pea...

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Bibliographic Details
Published in:Annals of biomedical engineering 2013-06, Vol.41 (6), p.1172-1180
Main Authors: Wee, Hwabok, Voloshin, Arkady
Format: Article
Language:English
Subjects:
Absorbing
Absorption
Adult
Ankle Joint - physiology
Biochemistry
Biological and Medical Physics
Biomedical and Life Sciences
Biomedical Engineering and Bioengineering
Biomedicine
Biophysics
Body Mass Index
Body Weight - physiology
Classical Mechanics
Delay
Female
Foot - physiology
Heels
Human
Humans
Male
Posture
Resonant frequencies
Strikes
Tibia - physiology
Vibration
Young Adult
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Summary:The load absorbing capability of the foot and ankle system (FAS) was characterized by measuring the transmissibility and the phase delay at the medial malleolus and the tibial tuberosity. The FAS of twenty subjects were exposed to sinusoidal vertical excitation (10–50 Hz with 5 Hz increments and peak to peak acceleration of 17.9 m/s 2 ) while sitting as a function of the external mass (0, 2.3, and 4.5 kg) and the foot postures (midstance, plantarflexion, and dorsiflexion). The results showed that the FAS plays important role in vibration transmission of lower leg. Adding extra mass affected a resonant frequency at the medial malleolus: 15–25, 30–35, and 35 Hz for with no additional mass, 2.3, and 4.5 kg, respectively. However, the changed postures of the FAS did not show significant effect on the resonant frequency. The applied mass affected the stiffness increase of the FAS and consequently resulted in the increase of the resonant frequency. This result supports the assertion that the resonant frequency of overweight or obese persons is similar to the major frequency component (25–35 Hz) of the heel strike.
ISSN:0090-6964
1573-9686
DOI:10.1007/s10439-013-0760-3